Re: [Pyobjc-dev] problem with NSTableView

[<bb...@ma...>]

On Thursday, Mar 13, 2003, at 14:56 US/Eastern, chris bunker wrote:
....
> self.knownEntities is a Python object that inheriting
> from NSObject and implementing the informal
> NSTableDataSource protocol. At this point it contains
> no data to display as I'm just setting the program up
> at this point.
>
> ....
> class entityTable(NSObject):
...

Change the declaration to:

> class entityTable(NSObject, NSTableDataSource):

(BTW:  Normally, that class would be called 'EntityTable' to be 
consistent w/ObjC and Python naming conventions.)

--

When implementing one of the informal protocols, you need to 
specifically declare [in Python] that you are doing so.  This allows 
PyObjC to figure out the correct types for the arguments to the method. 
   The alternative is to use the objc.selector() function to declare the 
appropriate types on the methods -- but that is considerably more 
tedious.

I posted a relatively long message a few days [weeks?] ago that 
explains informal protocols and their implementation in Python via 
PyObjC -- see the list archives.

b.bum
(Stuck in Cocoa/Java land right now.... makes me appreciate 
Cocoa/Python all the more)